Book Review Learn You A Haskell For A Great Good

Haskell is an amazing language to learn. One of the most common reasons to learn haskell is not to use it in practice but to learn functional programming concepts. Haskell makes the best method for learning functional programming. For example if you are coming to scala, learning functional programming can be really difficult. In haskell you get as a first class citizens many of the added FP library concepts to scala, for example a Monad is a first class citizen in haskell. No need for scalaz or whatever. Now you need a good book and I have a great book for you! The book is Learn You A Haskell For A Great Good.

I don't read it because of the haskell!

I read this book because I enjoy reading the author writing style! I read it because it's enjoyable to read! I read it to become a better scala developer!

What the book covers

So what does the book cover, or what did I learn from it? many things I found hard to grasp by other books! here is the list:

Types and type classes

Recursion

Higher order functions

Modules

Functors

Map,FlatMap etc

Monoids, Monads

IO

Functional Programming Concepts

How to understand haskell code

Great example's it explains just anything it shows you

Do you see the book is just amazing, and he does an excellent job describing these topics not as other books!

Comments

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For each topic we have a status column, use it for our own to track the status of your progress in the study this topic. In addition, we have a tutorial column where we point to the best video or tutorial for study this topic, this doc is a work in progress, please let us know for any suggestion.

Now by far the best book (although I think I could have created a better version) for studying for programing interviews is: "Cracking The Coding Interview"

Remember that actors interact only using message passing. In order to check actors behavior you can do it through the messages sent to them and back from them. So how do you test actors? You send them messages :)
To test actors that communicate only with messages, you need to send it a message and get reply back and check it.
akka has a TestProbe valp=TestProbe(); // record incoming messages in queue so you can assert and verify them.
Creating actor system for tests: implicitvalsystem=ActorSystem("TestSys") valtoggle= system.actorOf(Props[Toggle]) // this is the actor we are going to test.valp=TestProbe() // this is the test client actor which will record the messages.
p.send(toggle, "How are you") // probe --> tested actor: how are you?
p.exepectMsg("happy") // assert result is happy.
To have the probe actor created for you: newTestKit(ActorSystem("TestSys")) withImplicitSender { // we are in probe actor.valtoggle= system.actorOf(Props[Toggle…

You see it's much easier than you think there exists a limit set of rules you should apply to most of the programming interview questions which involves algorithms and data structures. I have prepared a summary of them for you, just read below and get your tips for today.When you have no clue / Under panic attack => Brute Force!

If you don't have a clue, brute force the fu**** question! In most cases the question you are presented with has a brute force solution. Mention clearly that you are brute forcing it and say that the time complexity is O(n^2) or whatever it is. Then think where do you waste time in your brute force solution, try to improve that part, in many cases, this will get you closer to the actual answer.

By brute forcing you get to be familiarize with the problem better. A common theme for brute forcing means you are going to have a for loop inside a foor loop something like the below, so it's great to get familiarize with common bruteforcing snippets,…

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